import { getCurrentPage } from '../common/utils'
function onPageScroll (event) {
  const { vanPageScroller = [] } = getCurrentPage()
  vanPageScroller.forEach((scroller) => {
    if (typeof scroller === 'function') {
      // @ts-ignore
      scroller(event)
    }
  })
}
export const pageScrollMixin = (scroller) =>
  // eslint-disable-next-line no-undef
  Behavior({
    attached () {
      const page = getCurrentPage()
      if (Array.isArray(page.vanPageScroller)) {
        page.vanPageScroller.push(scroller.bind(this))
      } else {
        page.vanPageScroller =
          typeof page.onPageScroll === 'function'
            ? [page.onPageScroll.bind(page), scroller.bind(this)]
            : [scroller.bind(this)]
      }
      page.onPageScroll = onPageScroll
    },
    detached () {
      var _a
      const page = getCurrentPage()
      page.vanPageScroller =
        ((_a = page.vanPageScroller) === null || _a === void 0
          ? void 0
          : _a.filter((item) => item !== scroller)) || []
    }
  })
